光时域反射仪 (ＯＴＤＲ) ,是光缆通信工程中测量光纤接头衰耗、判断光缆线路故障的重要测试仪表 ,其测量准确度直接影响到光缆的施工质量和维护判断。然而在新菏线增建二线及引入新乡地区相关通信工程中 ,在铁通城域网光缆抢修过程中 ,及查找被洪水冲垮的新乡—古固寨长途光缆 Optical Time Domain Reflectometer (OTDR) is an important test instrument for measuring optical fiber connector attenuation in optical fiber cable communication project and judging optical cable line fault. The measurement accuracy directly affects the construction quality and maintenance judgment of optical fiber cable. However, in the second line of the new He line and the related communications project introduced into the Xinxiang area, during the repair of the optical fiber cable of the Tietong metropolitan area network and the search for the long-distance optical fiber cable of Xinxiang-Gu Gu Zhai that was washed away by the floodwater